package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UsereService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UsereServiceImpl implements UsereService {

    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatProperties weChatProperties;

    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //1. 获取openId
        String openId = getOpenId(userLoginDTO.getCode());
        //2. 判断openId是否有效 无效则抛出异常
        if(openId == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //3. 判断当前用户是否是新用户 如果是则需要完成注册操作
        User user = userMapper.getByOpenId(openId);
        if (user == null) {
            user = User.builder()
                    .openid(openId)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        //4. 返回用户对象
        return user;
    }

    private String getOpenId(String code) {
        //调用微信服务完成openId的获取
        //1. 拼装数据
        Map<String,String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        //2. 发送请求
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        //3. 解析返回数据
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
